Triggering magic sysrequest functions from procfs

Red Hat Enterprise Linux 8.6 LPAR mode z/VM guest KVM guest

You can trigger the magic sysrequest functions through procfs.

Procedure

Write the character for the particular function to /proc/sysrq-trigger.

You can use this interface even if the magic sysrequest feature is not activated.

Example

To set the console log level to 9, enter: 
# echo 9 > /proc/sysrq-trigger